DF CI 10.5, DF 4 and DF 7
- Created by: A.B.
- Created on: 01-12-13 14:12
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- DF Catalysts and altering octane numbers CI 10.5, DF 4 and DF 7
- A catalyst speeds up a chemical reaction but is not used up in the reaction -> this process is called catalysis
- Heterogeneous catalysts are in a different physical state to the reactants.
- In a catalytic converter platinum or rhodium act as heterogeneous catalysts for the following reaction:
- To increase octane number (decrease tendency to auto ignite)
- Cracking
- A shorter, branched alkane and an alkene are usually formed
- A zeolite is used as a catalyst
- Reforming
- Alkanes are converted to cycloalkanes and hydrogen
- Cycloalkanes are converted to arenas and hydrogen
- In terms of octane numbers, arenas > cycloalkanes > alkanes
- Isomerisation
- Zeolite not catalyst but sieve to separate branched and unbranched isomers.
- Platinum catalyst
- Cracking
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